When figuring out how to set TUNE_CCARGS we should look for 'm64' not
'n64' in TUNE_FEATURES.
(From OE-Core rev: 7a9ea28e69e8121a559f610dd2330edd33f0a907)
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>